Income and Dividends Per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Income per share of common stock:
Net Income (Loss)	$ 30,831	$ 34,113	$ 26,057	$ 22,439	$ 64,944	$ 48,496
Weighted-average shares for basic income per common share (in shares)	28,637		28,590		28,630	28,564
Effect of dilutive securities:
Employee and director stock options (in shares)	92		108		98	97
Adjusted weighted-average shares and assumed exercises for diluted income per common share (in shares)	28,729		28,698		28,728	28,661
Basic net income per common share (in dollars per share)	$ 1.08		$ 0.91		$ 2.27	$ 1.7
Diluted net income per common share (in dollars per share)	1.07		0.91		2.26	1.69
Cash dividends per share of common stock (in dollars per share)	$ 0.06		$ 0.05		$ 0.12	$ 0.1
Options
Anti-dilutive securities
Anti-dilutive shares of common stock excluded from the calculation of dilutive securities	2		0		1	0